Constraining the Physical Properties of LBV Nebulae in the Galactic Center Environment

0 Assigned ID: 1899 ----- Attempting Submission 1 (Fri Mar 01 22:56:01 GMT 2013) ----- HST Phase I Proposal 1899 (cycle19_gclbvs.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 23:00:03 GMT 2013) ----- This is another (hopefully final) modification of phase II. Per suggstions by Andy Fruchter (relayed through Know Long), I have updated the dither pattern of two of my orbits for target WR102ka to use WFC3-IR-DITHER-BLOB. This replaces the double iteration of WFC3-IR-DITHER-BOX-MIN for two of the orbits. -1697885810 ----- Attempting Submission 1 (Thu Jun 27 04:14:33 GMT 2013) ----- ----- Attempting Submission 2 (Wed Aug 07 23:08:56 GMT 2013) ----- HST Phase II Proposal 13408 (phaseII_gclbv_modified_2013aug7.apt) successfully submitted. ----- Attempting Submission 3 (Wed Aug 07 23:17:33 GMT 2013) ----- ----- Attempting Submission 4 (Wed Aug 14 00:01:09 GMT 2013) ----- Constraining the Physical Properties of LBV Nebulae in the Galactic Center Environment The Galactic center (GC) is the most extreme site of massive star formation in the Galaxy, owing to the unusually dense reservoir of molecular gas that comprises the central ~500 pc. As a result, the region contains several massive starburst clusters and largest known concentration of ultra-rare luminous blue variable (LBV) stars, unstable hot supergiants experiencing super-Eddington eruptions that hurl massive nebulae into space and deliver copious amounts of mechanical energy to the ISM. Of particular interest, there are several extraordinary hot supergiants in the GC whose massive expanding LBV nebulae afford us the opportunity to study the evolution of such structures in the unique GC environment, where the dense ISM, extreme UV field, and ferocious ambient stellar winds are expected to have significant influence over the morphological evolution of LBV mass ejections. We propose to diagnose the physical properties of known LBV nebulae in the GC by measuring the morphology and mass of their warm gas component and its physical relation to the photo-ionized component. To achieve this, we will perform WFC3 narrowband imaging of collisionally-ionized [FeII] emission and photo-ionized HI (Paschen-beta). The imaging will be supplemented with ground-based spectroscopy, which will provide the chemical and kinematical information neccessary to derive the physical properties of the nebulae from the WFC3 images. We will be obtaining narrowband images of three emission-line nebulae in the Galactic center region with WFC3/IR in the F164N (FeII line) and F167N (continuum) filters. The targets are named 'Pistol', 'G0.120-0.048', and 'WR102ka'. Images in the F128N (Paschen-beta line) and F130N (continuum) filters will also be obtained for WR102ka only. The stellar fields in the Galactic center are extremely crowded. Our goal is to subtract off stellar continuum images from the emission-line images so that the nebulae can be isolated from the crowded field stars and studied in detail. Each target will be observed using the WFC3-IR-DITHER-LINE-3PT pattern. The dither pattern provides ample improvement of the PSF for our purposes, and allows for effective removal of hot pixels and cosmic rays. The MULTIACCUM STEP50/NSAMP=13 exposure parameters will be used for the F164N/F167N imaging, which achieves our required signal-to-noise and allows the dither sequences to pack neatly into 1 orbit for each object; for the F128N/F130N images of WR102ka, we will use STEP200/NSAMP=14 for the same reasons. For the Pistol and G0.120-0.048 fields, both of which contain multiple targets of interest, we require specific roll angles (between 255 and 271 deg) in order to include all sources of interest in the image frame. There is no roll angle restriction for WR 102ka. Fine guidance is a firm requirement, so multiple guide stars should be selected carefully (make sure the stars are single). HOT STARS 12 false false 0.0 0.0 false false false SUPPORTED STAR EMISSION LINE NEBULA J2000 J2000 K=7.3 STAR EMISSION LINE NEBULA J2000 J2000 K=9.5 STAR EMISSION LINE NEBULA This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 K=8.8 WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F167N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F167N WFC3/IR Imaging No No F164N WFC3/IR Imaging No No F167N WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F130N POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 3

false

POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 true 0.365 0.572 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 4

true

1375911579534 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13408 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "07-Aug-2013 14:39:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1671264 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13408 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13408 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 671 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) true 1 0 1375911609518 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13408 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "07-Aug-2013 14:40:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1671264 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13408 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13408 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 671 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) true 1 0 1376436881033 /private/var/folders/ks/llz639qd3n9g91642hnd6zyc0000gn/T/OPVisit7732397705700785556.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13408 :visit-id "03" :proposal-version -1 :trans-version "20130502" :date "13-Aug-2013 16:34:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 6685152 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13408 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13408 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13408 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13408 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13408 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2728 :al-overhead-at-end 0 :internal-dur-at-end 671 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3253 :pcs-gap 0 ) true 4 0